As another person said, it is important to step back and look at what has happened. Formulating theories on why something has not gone correctly is the first step to remediating the situation. When you can have at least a starting point as to where something has gone wrong it makes things easier in solving the problem. What should be done next is to act on the initial theories in steps to change or remediate what was wrong. If that change solves the problem, then its a success! If what you thought of changing does not fix the issue, then it is time to go back and make a new theory with that failure in mind, and making changes. Repeating until issue is fixed.